add a thermistor component
add a thermistor component

This component computes the temperature indicated by a thermistor.

It uses the Beta-parameter variant of the Steinhart-Hart equation,
described here:

    http://en.wikipedia.org/wiki/Thermistor

Signed-off-by: Sebastian Kuzminsky <62d754cc350e84d3b1c32ae79f976f5348e74a40@highlab.com>

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